Dental disk-holder



(No Model.)

' IM. GHIVERS. DENTAL DISK HOLDER.

I Patented Jan. 7, 1896.

NlTED STATES ROLAND M. CHIVERS, CF FALL RIVER, MASSACHUSETTS.

-DENTAL DISK-HOLDER.

SPECIFICATION forming part of Letters Patent No. 552,514, dated January7, 1896.

Application filed June 8,1895, Serial No. 552,049. (No model.)

To aZZ whom, it may concern:

Be it known that I, ROLAND M. CHIVERs, a citizen of the United States,residing at Fall River, in the county of Bristol and State ofMassachusetts, have invented certain new and useful Improvements inDisk-Holders for Dental Engines; and I do declare the follow- 'ing to bea full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same, reference being had to the accompanying drawings, and to theletters of reference marked thereon, which form a part of thisspecification.

My invention relates to dental tools, and its object is to provide aconvenient and simple holder for the sandpaper disks used on therotating mandrel of the engine.

Various devices have been proposed for this purpose. The ordinary modeof fastening is by a screw passing through the center of the disk into atapped socket in the end of the mandrel. The disadvantage of this isthat the screw is liable to be lost or misplaced when it is taken out toallow the worn disk to be re moved and a new one attached. In any eventthe manipulation of the screw or other means of fastening consumesconsiderable time, thereby interrupting the operation and increasing thediscomfort of the patient.

My invention aims to permit the disk to be changed very quickly, andwithout the removal of any separate fastening device.

The invention consists of two or more clamps, inclosed in a sleeve whichis mounted on the shank of the tool, and is movable axially to open theclamps, which are automatically closed by a spring in the sleeve, andengage with, a hole in the center of the disk.

I11 the drawings, Figure 1 is a side elevation of my disk-holderenlarged to about twice its natural size. Fig. '2 is a longitudinalsection. Fig. 3 shows one of the disks, and Fig. 4 is an. end view ofthe sleeve.

The shank A is suitably formed at one end for attachment to thehand-piece of the engine, as usual in such implements. Inclosingtheother end of the shank is a sleeve 13, which has the internal rib I),having a sliding fit on the shank. The rear end of the sleeve fits overa collar reformed on said shank, and between the collar a and the rib bis a helical spring C encircling the shank. Thesleeve has a longitudinalslot b in which slides a lug a on the collar a to keep the parts inproper relation. The outer end 17 of the sleeve is closed, with theexception of two parallel slots b through each of which passes a curvedfiat strip D loosely attached at its inner end to the end of the shankA, and having its outer end bent to form a hook (Z parallel with theclosed end 12 of the sleeve. hen the sleeve is thrust outwardly by thesprin g, the hooks are brought tightly against the end of the sleeve.When the sleeve is forced back, compressing the spring, the hooks arebrought together by reason of the divergence of the strips, as clearlyshown in Fig. 2.

The sandpaper or other disks E are pro vided with a central square hole0, just large enough to permit the hooks (Z to pass through when theyare brought together. The sleeve is then released, and in its outwardmovement 1. A disk holder comprising a shank, a

sleeve sliding thereon, a spring acting to thrust the sleeve outwardly,and clamping hooks per-- manently attached to the end of the shank andadapted to coact with the end of the sleeve, substantially as described.

2. A disk holder, comprising a shank, a sleeve sliding thereon, andhaving a closed end containing two slots, a spring acting to thrust thesleeve outwardly, and clamping hooks permanently attached to the end ofthe shank, and passing through the slots in the sleeve, substantially asdescribed.

3. A disk holder comprising a shank A having a collar a, a sleeve Bfitting the collar and having an internal rib I) fitting the shank, anda closed end 19 containing slots b a spring C- inolosed between thecollar and the rib, and brought together to pass through said hole,fiat, curved diverging strips D attached to the substantially asdescribed. 10 end of the shank and passingthrough the slots In testimonywhereof I affix my signature b and having hooks (Z parallel with the endin presence of two Witnesses.

5 of the sleeve, substantially as described. ROLAND M. CIIIVERS.

4:. The combination with a disk having a Vitnesses: square central hole,of a disk holder having ARBA N. LINCOLN, separable clamping hooksadapted when ANNEL L. ANELTT.

